Method and device for measuring permeability coefficients of stratums at different depths in field

A technology of permeability coefficient and stratum, which is used in measurement devices, field foundation soil survey, permeability/surface area analysis, etc., can solve problems such as the inability to fully reflect the real infiltration situation of the site and the real situation of the soil, and achieve simple operation. Effect

Inactive Publication Date: 2016-10-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims at the problem that the measured result of the current on-site measurement of the permeability coefficient is only the value of the permeability coefficient of a specific point on the surface, which cannot fully reflect the real seepage situation of the site, and the obtained results cannot reflect the real situation of the soil. A method and device for measuring the permeability coefficient at different depths on the site that can fully reflect the real seepage situation of the site, can truly reflect the real situation of the soil, and is simple to operate

Method used

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  • Method and device for measuring permeability coefficients of stratums at different depths in field
  • Method and device for measuring permeability coefficients of stratums at different depths in field
  • Method and device for measuring permeability coefficients of stratums at different depths in field

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Embodiment 1

[0033] Embodiment 1 A method of measuring the permeability coefficient at different depth formations on site according to the present invention comprises the following steps:

[0034] 1) Assemble the measuring equipment: connect the pile head with the connecting pipe, and seal the interface with a rubber ring; press the connecting pipe to the specified depth of formation; if the length of the connecting pipe is not enough, it can be extended, and the joint is also sealed with a rubber ring; install the supporting structure and Inject the water tank, and install a pressure measuring device in the water injection tank, and install a pressure device on the top of the water injection tank; insert the pre-installed connecting pipe with the pile head into the ground floor to be tested;

[0035] 2) Fill the water injection tank to the designated position;

[0036] 3) Apply pressure P to the water in the water injection tank, and record the time t at the same time 1 h 1 , t 1 The u...

Embodiment 2

[0045] Embodiment 2 The device constructed according to the method for measuring the permeability coefficient at different depths of the strata described in Embodiment 1 includes a water injection tank 1 at the top, a connecting pipe 2, a support structure 3, a pile head 4, a pressurizing device 5 and A pressure measuring device 6, the water injection tank 1 is installed on the top of the support structure 3, the inner bottom of the water injection tank 1 is equipped with a pressure measuring device 6 for measuring water pressure, the water injection tank 1 The top is equipped with a pressurizing device 5 for adjusting the water pressure in the water injection tank; the top water inlet of the communication pipe 2 is in sealing communication with the inner cavity of the water injection tank 1, and the bottom water outlet of the communication pipe 2 passes through The support structure 3 is then sealed and communicated with the pile head 4; the pile head 4 is divided into an inst...

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Abstract

A method and device for measuring permeability coefficients at different depths on site, the method comprising the following steps: inserting a connecting pipe into the ground layer to be measured, injecting water into a water injection tank to a designated position, and then injecting water into the water injection tank Apply pressure, calculate and measure the permeability coefficient and the average permeability coefficient of each stage; the device includes a water injection tank at the top, a connecting pipe, a support structure, a pile head, a pressurizing device and a pressure measuring device, and the water injection tank is installed on the top of the support structure , the inner bottom of the water injection tank is equipped with a pressure measuring device for measuring water pressure, and the top of the water injection tank is equipped with a pressurizing device for adjusting the water pressure in the water injection tank; the top water inlet of the connecting pipe is sealed with the inner cavity of the water injection tank In communication, the water outlet at the bottom of the communication pipe passes through the support structure and communicates with the pile head in a sealed manner. The beneficial effects of the invention are: it can fully reflect the real seepage situation of the site, can truly reflect the real situation of the soil body and is easy to operate.

Description

technical field [0001] The invention relates to a method and a device for measuring permeability coefficients at different depth formations on site. Background technique [0002] The permeability coefficient is an index that comprehensively reflects the permeability of soil, and the correct determination of its value is of great significance to the calculation of permeability. Its value can be measured in the laboratory, and can also be directly measured at the construction site. [0003] The measurement methods of permeability coefficient are divided into constant head method and variable head method. The sandy soil has strong water permeability, and the constant head method is generally used. For cohesive soil, due to its poor water permeability, the variable water head method is generally used. Indoor tests need to prepare soil samples, which greatly damages the original structure of the soil, resulting in a large difference between the measured results and the actual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08E02D1/02
CPCG01N15/082E02D1/027
Inventor 许四法陈浩严熙冯斌张义平
Owner ZHEJIANG UNIV OF TECH
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